Shimano FH-M645 hub axle - 12 mm
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Product Information
Full details
This guide is for owners of the Shimano FH-M645 hub looking for a specific replacement part. The key benefit is ensuring a perfect fit and reliable performance with a genuine Shimano component. A caveat is that this is a highly specific part, intended only for the FH-M645 model. This product is the 12 mm hub axle, designated as item number 2 in the exploded diagram, with the part number Y3TT98020.
All features
| Model Part Number | 3TT9802 |
|---|---|
| Brand | SHIMANO |
Extended Product Information
FAQs
Is this axle compatible with other Shimano hubs?
No, this specific 12 mm axle (Y3TT98020) is designed exclusively for the Shimano FH-M645 hub model.
What does 'Item 2 in the diagram' refer to?
It refers to the position of the hub axle within the official exploded parts diagram for the Shimano FH-M645 hub.
What is the diameter of this hub axle?
The diameter of this hub axle is 12 mm.
Do I need special tools to install this axle?
Installation typically requires standard bicycle tools such as cone wrenches and possibly a torque wrench for proper adjustment. Refer to Shimano's service documentation for specific tool requirements.
How do I know if I need to replace my hub axle?
Signs include a loose-feeling rear wheel, excessive play even after adjustment, or visible damage to the axle itself. If the hub bearings are rough or damaged, it's often a good time to consider replacing related components like the axle.
Where can I find the official exploded diagram for my FH-M645 hub?
You can usually find official Shimano exploded diagrams on the Shimano website by searching for your specific hub model (FH-M645) in their support or parts section.
Troubleshooting
Axle feels loose after installation
Re-adjust the hub cones and locknuts. Ensure the axle is properly seated and the locknuts are tightened to the correct torque specification for your FH-M645 hub.
Wheel is not spinning freely
The hub cones may be overtightened. Loosen the hub cones slightly until the wheel spins freely without noticeable side-to-side play.
Difficulty installing the axle
Ensure you are using the correct axle (Y3TT98020) for the FH-M645 hub and that all internal hub components are clean and properly aligned. Refer to the official Shimano service manual or exploded diagram.
Pros and Cons
Pros
- Guaranteed compatibility with FH-M645 hub.
- Maintains original hub performance and integrity.
- Genuine Shimano quality and reliability.
- Precise 12 mm diameter for secure fitment.
Cons
- Only compatible with FH-M645 hubs.
- May require specialized tools for installation.
- Specific part, not a universal solution.
Setup, Compatibility & Care Instructions
Compatibility: This 12 mm hub axle is specifically designed for the Shimano FH-M645 rear hub model. It is not compatible with other Shimano hubs or hubs from different manufacturers.
Setup (Installation):
- Disassembly: Carefully disassemble the FH-M645 hub, noting the order and orientation of all parts. Refer to the official Shimano exploded diagram for your FH-M645 hub, identifying item number 2 as the axle.
- Inspection: Clean all hub components and inspect bearings and seals for wear or damage. Replace if necessary.
- Installation: Insert the new Y3TT98020 axle into the hub body. Ensure it seats correctly.
- Reassembly: Reassemble the remaining hub components, including cones, bearings, and locknuts, according to the manufacturer's specifications. Pay close attention to bearing adjustment and locknut torque to avoid overtightening or undertightening, which can damage the hub or cause poor performance.
- Final Check: Once the wheel is reinstalled on the bike, spin the wheel to ensure smooth rotation and check for any side-to-side play.
Care: After installation, regular cleaning of your bicycle and drivetrain will help maintain the longevity of the hub. Avoid high-pressure washing directly at the hub internals. Periodic checks for play in the rear wheel are recommended.